4,4’-Dipyridylcopper(II) nitrate as a 2D organometallic framework

Abstract

The crystal structure of the organometallic framework, namely, 4,4’-dipyridylcopper(II) nitrate with the DMSO molecule in the copper coordination sphere, has been described, the structural features have been established by the X-ray method. Crystallographic data: C55H93Cu2N12O23S7, М 1641.91; monoclinic syngony, space group P 1 21/n 1; cell parameters: a = 15.490(3), b = 14.760(3), c = 15.980(3); a = 90, β = 90.10(3), g = 90 deg.; V = 3653.5(13) Å3, Z = 2, ρcalc = 1.493 g/cm3. The bidental ligand in the organometallic framework is 4,4’-bipyridyl; copper, being a complexing ion, forms a coordination octahedron, the nitrogen atoms of bipyridine fragments are in four equatorial positions, the oxygen atoms of nitrate ion and dimethyl sulfoxide are in two axial positions. The Cu–N bond lengths in the equatorial position are in the range of 2.014–2.031 Å, and the Cu–O bond lengths are 2.297 Å and 2.515 Å. The occupation of the equatorial positions by 4,4’-dipyridyl leads to formation of a layered structure, which distinguishes the resulting compound from another MOF based on copper(II), nitrate ions and 4,4’-dipyridyl, in which all the equatorial positions are occupied by NO3-groups. The individual layers in the obtained 4,4’-dipyridylcopper(II) nitrate are not crosslinked; they are shifted relative to neighboring layers. The pyridyl rings of 4,4’-dipyridyl are rotated at an angle of 5.77(2) degrees. relative to each other.